Project Document Number GTMP-5076 L-1011oem Wing Upgrades W. M. Langford Advanced Models Systems & Sensors Branch 22 June 2004 (a.k.a. L-1011_mod1) Generic Transport Model Project

Project Document Number GTMP-5076 L-1011_mod1 Triangular aluminum plate (1/4” thick) installed in each wing from the forward cam-lock attachment to the main landing gear assembly. Removable Inboard main gear mounting plate attachment to facilitate main gear installation. OEM spar replaced with a 1.25” OD x 0.125” thick aluminum tube (6061-T6). Wing Upgrades

Project Document Number GTMP-5076 L-1011_mod1 (left wing, bottom, shown) Modified Lower Main Wing Hatch OEM nacelle & pylon assembly

Project Document Number GTMP-5076 L-1011_mod1 Hatch attachment screws Hatch clearance holes Hatch attachment screws (left wing, bottom surface shown)

Project Document Number GTMP-5076 L-1011_mod1 Inboard Landing Gear Mounting Plate, removable

Project Document Number GTMP-5076 L-1011_mod1 (Main Wing Hatch Removed) 3x #10-32 SHCS With Hex Lock-Nuts Inboard Landing Gear Mounting Plate, removable 2x #8-32 FHSS 3x #6-32 FHSS 3x #6-32 SHCS

Project Document Number GTMP-5076 L-1011_mod1 OEM paper tube, location unchanged OEM spar tube attachment hole, unused 3x #10-32 SHCS w/ hex lock-nuts, go through the plate & the spar tube, clearance holes on the upper wing surface

Project Document Number GTMP-5076 L-1011_mod1 (solid model shown – lower outer skin removed) OEM paper tube Main ¼” plate Inboard ¼” plate 1.25OD x 1/8” tube

Project Document Number GTMP-5076 L-1011_mod1 (sub-structure assembly – wing not shown) Relief notch to set main gear assembly orientation Plate sandblasted & acetone cleaned before final bonding

Project Document Number GTMP-5076 L-1011_mod1 Fill gap as needed with structural adhesive & chopped fiberglass (sub-structure assembly – end viewed) Cut-off excessive bolt length as needed OEM paper tube

Project Document Number GTMP-5076 L-1011_mod1 (modified left wing – bottom shown) Routed out pockets as needed 3x ½” clearance holes, locate on assembly of the sub-structure OEM tube location, unchanged

Project Document Number GTMP-5076 L-1011_mod1 (sub-structure assembly shown) Cam-lock block Inboard main gear Mounting plate 2X #8-32 FHSS 2X #4-40 SHCS #6-32 SHCS As needed Main plate, ¼” thick

Project Document Number GTMP-5076 L-1011_mod1 Aluminum block with 3 holes tapped to #6-32 thru, bonded to underside of flange for inboard main gear assembly mounting Inboard main gear mounting plate, notched deep, as needed (aft viewed)

Project Document Number GTMP-5076 L-1011_mod1 Balsa & 2 layers of carbon cloth installed over the plate

Project Document Number GTMP-5076 L-1011_mod1 (cam-block drawing)

Project Document Number GTMP-5076 L-1011_mod1 (inboard main gear plate drawing)

Project Document Number GTMP-5076 L-1011_mod1 (main plate drawing)

Project Document Number GTMP-5076 L-1011_mod1 END  Total weight increase for “L-1011_mod1” was 4.13 lbs.  Higher wing loading for the pilots.  More forgiving on hard landings however the main gear assemblies need replacing more often.  Some time involve in setting the main gear assembly orientation so that it operate correctly.  Labor to do the upgrades was 60 man-hours.  A better design would have the main plate sitting on top of the OEM paper tube. FINAL RESULTS & CONCLUSIONS